AMD has put together a very basic OpenCL tutorial using the proposed C++ bindings to OpenCL. This tutorial can be found at
AMD is working with Mindshare to develope a 3 day class on OpenCL programming. The class is not yet available but should be soon. For more information
Nvidia webinars that provide an interactive learning experience. This series will cover the basics of data parallel computing on GPU’s leveraging NVIDIA’s CUDA architecture . Tutorials will cover many topics including C for CUDA, programming to the OpenCL™ API , using Direct X Compute and performance optimization techniques, presented by NVIDIA Developer Technology Engineering team and NVIDIA staff online to answer Questions.
You can register for these at http://developer.nvidia.com/object/gpu_computing_online.html